<p>This is a <span style="color:#8e44ad;"><strong>Critical Reasoning</strong></span> question, as indicated by the phrases "if true" and "weakens the support". We need to follow a process for these questions.</p>
<p><span style="color:#8e44ad;">Step 1:</span> Identify the CONCLUSION of the argument.</p>
<ul>
<li><strong>Conclusion:</strong> The reason for the low number of music copies purchased for the festival by the committee was due to the photocopier.</li>
</ul>
<p><span style="color:#8e44ad;">Step 2:</span> Identify the REASON(S) the author has identified to support their conclusion.</p>
<ul>
<li><strong>Reason/Evidence:</strong> The festival has 1,200 singers, so, according to the author at least, it doesn't make sense that only 12 copies of the music were purchased. From this evidence, the author assumes that the committee has photocopied the music and distributed the copies to most of the 1,200 singers.</li>
</ul>
<p><span style="color:#8e44ad;">Step 3:</span> Engage in a LOGICAL LEAP that <u><strong>undermines</strong></u> the conclusion. We can do this in two ways: attack the evidence the author has provided or provide additional evidence that weakens his/her conclusion.</p>
<ul>
<li><strong>Logical Leap: </strong>Perhaps many of the 1,200 singers already owned the music. Or perhaps most of the 1,200 singers purchased the music themselves. Perhaps most of the 1,200 singers MEMORIZED the music. We have no idea. There are many possible scenarios that undermine the author's conclusion.</li>
</ul>
<p><span style="color:#27ae60;"><span style="font-size:20px;">The Right Answer</span></span></p>
<p><span style="color:#27ae60;">C:</span> This choice matches one of our logical leaps above. If each singer purchased his/her own music, then it makes sense that the committee only bought a limited number. The author's conclusion that the "photocopier" was responsible thus holds no water.</p>
<p><span style="color:#e74c3c;"><span style="font-size:20px;">The Wrong Answers</span></span></p>
<ul>
<li><span style="color:#e74c3c;">A:</span> Whilst this does provide an alternate reason for the low music purchases from the committee, we should still be expecting around 400 copies sold, rather than 12. This does not explain that, so it could have still been photocopying.</li>
<li><span style="color:#e74c3c;">B:</span> Once again, similar to option A, we would still expect around 600 copies to be bought for the half that didn't know the music.</li>
<li><span style="color:#e74c3c;">D:</span> Again, this is very similar to choice B. We would still expect around 600 copies to be purchased, so the author's argument that photocopying took place still holds.</li>
<li><span style="color:#e74c3c;">E:</span> This choice has nothing to do with the argument. The increase in popularity of the music after the festival has no impact on the copies of music sold before the festival.</li>
</ul>